main.lua

local token = require("token")
local lexer = require("lexer")

lexer.input = "struct Node {\n"
    .. "\tdata: int;"
    .. "\tleft: *Node;"
    .. "\tright: *Node;"
    .. "}\n"
    .. "fn add_nums(x: int, y: int) int {\n"
    .. "    return x + y;\n"
    .. "}\n"
    .. "\n"
    .. "// check if str starts with an h\n"
    .. "fn starts_with_h(s: str) bool {\n"
    .. "    return s[0] == 'H';\n"
    .. "}\n"
    .. "\n"
    .. "fn printNum(n: int|f32) void {\n"
    .. "    print(n);\n"
    .. "}\n"
    .. "let rootNode = Node{5, nil, nil};\n"
    .. "print(rootNode.data);\n"
    .. "\n"
    .. "const ten: int = 5 + 5 * 4 / 2 - 5;\n"
    .. "const newNum = add_nums(ten, 25);\n"
    .. "const isTen = ten == 10 ? true : false;\n"
    .. "const nothing = nil;\n"
    .. "\n"
    .. 'let mystring: str = "Hello, Lexer!";\n'
    .. "for ch: str in mystring {\n"
    .. "    print(ch); // a comment here!\n"
    .. "}\n"
    .. "\n"
    .. "const myfloat: f32 = 69.420;\n"
    .. "\n"
    .. "let counter = 0; \n"
    .. "let otherCounter = 20; \n"
    .. "\n"
    .. "while counter < 10 or otherCounter > 10 {\n"
    .. "    otherCounter -= 1;\n"
    .. "    counter++;\n"
    .. "}"

lexer:readChar()

local tok = lexer:nextToken()
while tok.type ~= token.TokenType.EOF do
    print('Token{ literal: "' .. tok.literal .. '" type: ' .. tok.type .. " }")
    tok = lexer:nextToken()
end